/Engine/Source/Runtime/Engine/Public/WorldPartition/RuntimeHashSet/WorldPartitionRuntimeHashSet.h
class URuntimeHashSetExternalStreamingObject : public [URuntimeHashExternalStreamingObjectBase](API\Runtime\Engine\WorldPartition\URuntimeHashExternalStreamingObj-)
TArray<TObject...
NonSpatiallyLoadedRuntimeCells
TUniquePtr< FSt...
SpatialIndex
Transient.
TArray<TObject...
SpatiallyLoadedRuntimeCells